1871] A [Cope. 
vertebrals are short coftin-shaped, concave or emarginate in front; a stout 
laminar neural spine supports the vertebra below. 
The sculpture of all the bones is a delicate impressed punctation, the 
impressions forming lines or delicate grooves in some places. These run 
obliquely across some of the costals and marginals, and sublongitudinally 
on the posterior lobe of the plastron. The corneous scuta have left dis- 
tinct impressions. The marginals extended on to the costal bones at the 
place of the free marginal bones. The vertebrals were a little longer than 
wide, with bracket shaped lateral sutures, and openly emarginate below. 
The intergular plate was pentagonal, with straight sides, and broader 
-than long. The gulars are short and not prolonged very far on the 
outer margin of the plastron. The pectorals are narrowed laterally, and 
present a convex median outline on the mesosternum. The abdomino- 
femoral suture crosses a little behind the middle of the hyposternal bone. 
The median longitudinal suture winds from side to side on the posterior 
lobe in the most erratic fashion, abnormally no doubt, and the suture for 
the anals is anterior, convex in front, sigmoid at the sides. 
Measurements. M. 
Ioeviagt OF PIABtLOM WESbOLEN) si 3 56 esc as te ws et ee 0.457 
se from front to postabdominal suture............... .34 
Me Ma toMignG): Ny postermal.. vtck. sy ane oes 195 
ee bE to hiyosternal. 2 ck shied onions. .104 
iS pues to mesostetnals snc cae on -038 
Width at MeSOSteruals ¢. ie eco cies ep eet ss 194 
fee OL es OO rhe en ee 095 
oo diy WUSUADUOMMMAL SULULCs «tol. vse tb eats (ics ces 22 
Minekness OF mesosternal behind. 2... kes. sess ewe 0116 
OL Gy posteinel medially... 6.6.66... as -0158 
Width of average costal at vert. scute suture...........-. 055 
PEIMCMORS OL SAMO soc sss thier uncer toni bas. O11 
Otal lengur adqaGeut VOLUCDMAls «cece iss oy hs ce wes -066 
GUOHLCSE WIE gt ee ent .036 
Width G0v au Cll 2. on, es es rae en ss sets wes 022 
Length of first free marginal from bridge.... ............ .0655 
Wau OL OUb 6 cic ier 06! nan es iia sear tan cae eee 10 
SIMLGMERN COMMING it Ck eet MU ce rs es es 6s) oes cel 0175, 
* OL Hires marcinal ProxmMally ss.) 07. cee eyes as OF 
Width iA er OE ge O75 
Length we ee Ee 0548 
The type specimen of this species is about twice the size of that of Z. 
striatula. It also differs in some respects which might be attributed to 
age, as the greater recurvature of the marginal bones and the greater ex- 
tent or prolongation of the thickening on the inside of the marginals next 
the bridge. But there are others which appear to be specific. Thus 
there is very little evidence of cross-union of sternal elements in the Z. 
striatula, and the sculpture is twice as coarse and so much more marked. 
